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The same issue for rhel7.

cyrus-sasl-2.1.26-13.el7
cyrus-imapd-2.4.17-5.el7
krb5-server-1.11.3-34.el7

Only FAIL I can see running the reproducer test is in:

    rlPhaseStartTest "Try imtest with gssapi without running kinit"
        rlIsRHEL 5 && rlRun "klist -5" 0
        rlIsRHEL '>=6' && rlRun "klist" 0
        echo "" > /var/log/imapd.log
        rlRun "do_imtest" 0
        rlRun "cat /var/log/imapd.log"
        rlIsRHEL 5 && rlRun "cat /var/log/imapd.log | grep imtest | grep \"GSSAPI Error\" | grep \"No credentials cache found\"" 1
        rlIsRHEL '>=6' && rlRun "cat /var/log/imapd.log | grep imtest | grep \"GSSAPI Error\" | grep \"Credentials cache file '/tmp/krb5cc_0' not found\"" 1
    rlPhaseEnd

This code seems to be completely wrong. You expect klist to return 0 when there's no kerberos ticket created yet. Please fix it. I'm closing this as NOTABUG now, but if you find a better reproducer, feel free to reopen it.